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TRPM4 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

TRPM4 gene

The TRPM4 gene encodes a channel protein that regulates the flow of cations, playing a vital role in heart rhythm and electrical signaling.

Normal Function

The TRPM4 gene provides instructions for making a protein called transient receptor potential cation channel subfamily M member 4 (TRPM4). This protein acts as a channel, opening and closing at specific times to control the flow of positively charged atoms (cations) into and out of cells. The TRPM4 channel is embedded in the outer membrane of cells throughout the body, but it is abundant in heart (cardiac) cells.

TRPM4 channels play a major role in signaling the start of each heartbeat, coordinating the contractions of the upper and lower chambers of the heart, and maintaining a normal heart rhythm. In addition to regulating electric signaling in the heart, the TRPM4 channel is important for the normal functioning of the immune system, the nervous system, the kidneys, and the pancreas.

Health Conditions Related to Genetic Changes

Progressive familial heart block

A few mutations in the TRPM4 gene have been found to cause progressive familial heart block. This condition alters the normal beating of the heart and can lead to fainting (syncope) or sudden cardiac arrest and death. The TRPM4 gene mutations change single protein building blocks (amino acids) in the TRPM4 channel. The altered channels have increased activity at the cell membrane, which likely alters the cell's ability to generate electrical signals because of the increased cation flow. Interruption of this signaling causes heart block, and the death of these impaired cardiac cells over time can lead to a buildup of scar tissue (fibrosis), worsening the condition.

Brugada syndrome

The TRPM4 gene has also been associated with Brugada syndrome, a condition that affects the heart's electrical system.

Other Names for This Gene

  • calcium-activated non-selective cation channel 1
  • hTRPM4
  • long transient receptor potential channel 4
  • LTrpC4
  • melastatin-4
  • transient receptor potential cation channel, subfamily M, member 4
  • TRPM4_HUMAN
  • TRPM4B

Frequently Asked Questions

Testing is appropriate after a documented unexplained heart block, especially if there is a first‑degree relative with similar conduction disease. Once a pathogenic TRPM4 variant is identified, cascade testing is recommended for all first‑degree relatives, even if they are asymptomatic, because conduction abnormalities can develop later in life.
Patients often present with unexplained bradycardia, recurrent fainting (syncope), or a family history of early‑onset heart block. An electrocardiogram may show first‑degree AV delay that progresses to higher‑degree block, sometimes without structural heart disease.
Management typically includes implantation of a pacemaker once the block reaches second‑degree or higher, which prevents brady‑arrhythmia–related syncope. In some cases, an implantable cardioverter‑defibrillator (ICD) is added if ventricular arrhythmias are documented or if there is a family history of sudden death. Beta‑blockers are generally avoided because they may worsen conduction delay.
Patients should avoid excessive alcohol, stimulant medications, and electrolyte disturbances (especially low potassium or magnesium) that can exacerbate conduction problems. Maintaining a regular sleep schedule, staying hydrated, and promptly treating infections (which can precipitate heart block) are practical measures.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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